It doesn't, not to a point where it would matter. This is what happens:
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They are primarily talking about ratio in serum however, and here the normal ratio in adulthood is around 1. Balding people have a different problem however:
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We have approximately 5 times more testosterone relative to its counterbalancing anti-androgen, epitestosterone, and this is enough to account for all of the traits of androgenic alopecia. No need for any kind of mythical androgen sensitivity when there is such a hormonal imbalance that you can actually measure.